Pbフリーはんだの金属学的基礎
(7−3) SACの低融点化
(7−3−1) SAC+Bi
シャープ
SAC系およびSACB系はんだボールCSP
はんだボールとペーストの組み合わせ
Kanchanomai
Kanchanomai
Suhling
SAC387
Sn−3.35Ag−1.0Cu−3.3Bi
Sn−3.8Ag−0.7Cu−2.0Bi
Sn−3.0Ag−0.5Cu−8.0In
PWB:ENIG
dfr
Celestica
基板の表面処理
端子めっきはSn−PbあるいはマットSn、はんだボールはSAC305
Cuを含まないはんだ(SnAgBi、Paul,orchid)はNi系基体との間に不規則なIMCを形成。
Zhao
The growth kinetics of interfacial IMC layers versus the aging time at
two temperatures: (a) 140 °C and (b) 180 °C. The solid squares,
circles and triangle represent the relative thickness of total interfacial
layers in Sn-3Ag-0.5Cu/Cu, Sn-3Ag-0.5Cu-1Bi/Cu, and Sn-3Ag-0.5Cu-3Bi/Cu,
respectively. The hollow ones in the bottom of (b) represent the thickness
of Cu3Sn layer.
The microstructure evolution of Sn-3Ag-0.5Cu/Cu and Sn-3Ag-0.5Cu-3Bi/Cu
joint samples during aging process: (a) 0Bi, as soldered; (b) 3Bi, as soldered;
(c) 0Bi, aged at 150 °C for 1000 h; (d) 3Bi, aged at 150 °C
for 1000 h
Shear fracture morphology of the couples aged at 140 °C: (a) 360 h, aged at 140 °C, Sn3Ag0.5Cu/Cu; (b) 600 h, aged at 140 °C, Sn3Ag0.5Cu/Cu; (c) 360 h, aged at 140 °C, Sn3Ag0.5Cu3Bi/Cu; (d) 600 h, aged at 140 °C, Sn3Ag0.5Cu3Bi/Cu
(7−3−2) SAC+In
Sharif In 電解Niと無電解Ni(16P)、Auは0.5μm
Sn−9In−3.5Ag−0.5Cu
アサヒ
(7−3−3) SAC+In+Bi
Fe、In+Ce
塩化亜鉛フラックス